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When looking for guidance, it's best to go to the experts.
The two best how-to books I've read on writing memoir are these:
Writing a Life: Teaching Memoir to Sharpen Insight, Shape Meaning--and Triumph Over Tests by Katherine Bomer
Writing Personal Essays by Sheila Bender, or the second edition, Writing and Publishing Personal Essays
You may be able to find a copy at your local library in the 808 section.
Hope that helps.